which two situations does the dead space reclamation feature of VAAI Thin Provisioning offer the ability to reclaim blocks of a thin provisioned LUN on a array?

Under which two situations does the dead space reclamation feature of VAAI Thin Provisioning offer the ability to reclaim blocks of a thin provisioned LUN on a array? (Choose two.)

A.
When a virtual machine is migrated to a different datastore

B.
When guest OS files in a virtual disk are deleted

C.
When a virtual machine is migrated to a different host

D.
When a virtual disk is deleted